A Large Current Source with High Accuracy and Fast Settling

Hi guys,

I used the guide from AD itself to layout a fast settling current source:

https://www.analog.com/en/analog-dialogue/articles/a-large-current-source-with-high-accuracy-and-fast-settling.html

This is the final circuit which was layouted in exactly this way. Simulating it was not possible as the simulation model of ADA4898 or ADA4870 (one of them) does not work in LTspice.

My problem is that if everything is supplied well and the input voltage is changed, nothing changes--> circuit does not respond to a change of the input voltage.

The ADA4898 were already supplied single supply, dual supply, also the ADA4870.

Does anyone have an idea why the circuit is not responding to the input voltage? The on pin is set to low (as in the description) to switch on the IC.

Footprints are checked, every single PCB component was measured again, solder errors are not seen.

Thanks and KR marc